Concrete-mixer.



G. F. NYE.

CONCRETE MIXER.

APPLICATION FILED MAY15, 191s.

1,081,91 1. Patented Dec. 16, 1913.

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FFICE.

GEORGE FRANCIS NYE, OF KEARNEY, NEBRASKA.

CONCRETEMIXER.

To aZZ whom it may concern Be it known that I, Gnonon F. Urn, a citizen of the United States, residing at Kearney, in the county of Buffalo and State of Nebraska, have invented certain new and useful Improvements in Concrete-lVIixers, of which the following is a specification.

This invention relates to concrete mixers, and has special reference to the means for feeding into the mixing drum the cement, sand, and gravel or broken stone, as the drum is rotated in the mixing operation.

The object of the invention is to provide a mixer of simple construction by the use of which the several ingredients will be positively fed into the drum and will be thoroughly commingled so that the product will be of a homogeneous quality.

A further object of the invention is to provide a novel and simple mechanism whereby the cement will be drawn into the mixing drum above the sand and gravel and will be scattered so that it will spread over the quantities of sand and gravel fed into the drum and will not be concentrated so as to leave voids in the finished mass.

The invention is illustrated in the accompanying drawings and will be hereinafter fully described, and consists in certain novel features which will be particularly pointed out in the claims following the description.

In the drawings: Figure 1 is a side elevation of a concrete mixer embodying my present invention; Fig. 2 is a longitudinal section of the same; Fig. 3 is a transverse sec tion on the line 3-3 of Fig. 2.

In carrying out my invention, I employ a main frame 1 which is preferably supported upon wheels 2 so that it may be transported easily from place to place or shifted along the work when it is being utilized to form concrete for sidewalks or for similar purposes. Upon this frame 1, I provide suitable bearings, indicated at 3, in which a main shaft 4 is j ournaled, and the said bearings are so disposed that the said shaft will be inclined, as clearly shown. The mixing drum 5 is secured directly to the said shaft by spokes or radial arms 6 and is preferably of a conical formation, the lower side 7 of the drum being horizontal, as clearly shown in Figs. 1 and 2. Both ends of the drum are open and a tank 8, containing a supply of water, is supported upon the main frame adjacent the rear or smaller end of the drum upon standards or other suitable sup- Speeification of Letters Patent.

Application filed May 15, 1913.

Patented Dec. 16, 1913.

Serial No. 767,853.

ports 9, a pipe 10 leading from the tank through the rear open end of the drum and discharging within the same, as will be readily understood. The said pipe is provided with a cutoff valve 11 of any convenient or preferred type so that the [low of water may be regulated according to the demands of any particular material.

The front end of the main frame extends somewhat beyond the larger front end of the mixing drum, and upon the said end of the drum are secured hoppers 12 and 13 which are intended to hold the sand and gravel or broken stone which are to be fed into the drum. These hoppers are arranged side by side and have a single inner wall in common, as shown at 14, the said wall being constructed with a groove or bead 15 which fits partly around the driving shaft 4-, as shown. A. grooved plate 16 is secured rigidly to the partition or inner wall 14 and fits around the said shaft 4 so that the said plate with the bead 15 constitutes an elongated bearing to support the driving shaft and also aids in supporting the hoppers, while preventing the material in the hoppers bearing upon the shaft and unduly wearing the same. The lower ends of the hoppers are open and are disposed so as to touch or be very minutely spaced from the bottom of the drum, so that the material in the hoppers under the influence of gravity will be deposited directly upon the inner surface of the drum.

To regulate the flow and prevent excessive quantities of the materials being drawn into the drum, I provide sliding closures or gates 17 which may be easily adjusted so as to uncover the lower ends of the hoppers to a greateror less degree, as may be desirable under any particular circumstances.

Tmmediately adjacent the hoppers 12 and L3, I fix upon the driving shaft a small beveled feeding disk 18 and the cement hopper 19 is supported above the hoppers 12 and 13 by brackets 20 rising from the main frame, as shown. It will be readily noted that the cement hopper is so disposed as to pass through the open front end of the drum between the edge of the same and the upper edges of the hoppers 12 and 13 and the lower end of the cement hopper is arranged in juxtaposition to the feeding disk 18. This cement hopper is also equipped with a gate or adjustable closure 21 at its lower end by which the flow of cement may be regulated, as will be readily understood.

To prevent the material flowing from the front end of the drum, an annular flange 22 is provided around the edge of the same, as clearly shown in Fig. 2.

It is thought the operation of the device will be readily understood. The several hoppers have their lower ends arranged immediately adjacent the moving surfaces of the mixing drum and the feeding disk and the material in the hoppers will flow by gravity directly onto the said surfaces. Consequently, as the drums are rotated by a hand wheel or other power device applied to the shaft 4, the materials will be continuously drawn into the drum and will tend to ride up the side of the same. They will, of course, fall from the sides of the drum toward the center thereof as they reach higher levels and will, consequently, be gradually fed to the rear or discharge end of the drum. As the materials continually fall from the sides of the drum toward the center thereof, they will be thoroughly commingled so that when they reach the point where the water enters the drum they will be commingled to such an extent that additional mixing will be practically unnecessary and thorough wetting of the entire mass will be accomplished during the short interval they remain in the drum after the water is discharged upon them.

It will be readily noted that the feeding disk 18 will tend to spread the cement, so that, instead of falling upon the sand and gravel in a heavy compact body, it will be scattered so as to form an even coating over the entire quantity of sand and gravel. It will also be noted that the hoppers are so disposed as to economize space and, at the same time, be supported upon the frame in such a manner that they will be balanced and no great preponderance of weight will be found at either side of the main frame. The moving of the device from point to point is thereby facilitated and bending of the main driving shaft is avoided. The device is exceedingly simple in the construction and arrangement of its parts and will prove highly efficient for the purposes for which it is designed.

What I claim is 2- 1. In a concrete mixer, the combination of a drum, an operating shaft carrying said drum, a feeding disk secured upon the said shaft within the drum, and hoppers having their lower ends entering the drum and disposed in juxtaposition to the bottom of the drum and the said feeding disk respectively.

2. A concrete mixer comprising a main frame, a driving shaft mounted in the main frame, a mixing drum carried by said shaft, hoppers disposed upon the main frame at opposite sides of the shaft and entering the drum, a feeding disk on the shaft within the drum, and a hopper disposed above the first-mentioned hoppers and having its lower end immediately over the said feeding disk.

8. A concrete mixer comprising a main frame, a driving shaft mounted on said frame, a drum carried by said shaft, a pair of hoppers supported upon the main frame with their lower ends within the drum and having a common inner wall, said wall having a groove to receive the driving shaft, and a plate secured to the said wall and fitting around the driving shaft.

In testimony whereof I aflix my signature in presence of two witnesses.

GEORGE FRANCIS NYE. [L8,]

Witnesses:

H. H. SnLLnox, DAN Mourns.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. I 

